Income Taxes Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Taxes [Abstract]
Effective Income Tax Rate, Continuing Operations	19.80%	15.70%	19.40%	12.30%
Unrecognized Tax Benefits	$ 80.8		$ 80.8
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	13.2		13.2
Deferred Tax Liabilities, Other	$ 16.3		$ 16.3

Income Taxes [Abstract]

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Amount of deferred tax liability attributable to taxable temporary differences classified as other.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of unrecognized tax benefits.

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Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

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